Which of the Following Represents the Motion of a String

Multiple Choice

Which of the following represents the motion of a string element at an antinode of a standing wave?

A) y = (6.0 mm) sin[(3.0 m^-1) x + (2.0 s^-1) t]
B) y = (6.0 mm) cos[(3.0 m^-1) x - (2.0 s^-1) t]
C) y = (6.0 mm) cos[(3.0 m^-1) x + (2.0 s^-1) t]
D) y = (6.0 mm) sin[(3.0 m^-1) x
E) y = (6.0 mm) cos[(2.0 s^-1) t